This task is similar to
CONC-449, but this task is for the server itself, and not for MariaDB Connector/C.
Currently, if the $MYSQL_HOME environment variable is set, then MariaDB reads the $MYSQL_HOME/my.cnf configuration file, if it exists:
To further MariaDB's branding, I think MariaDB should similarly check $MARIADB_HOME/my.cnf, if the $MARIADB_HOME environment variable is set.
The approach should be to only use MARIADB_HOME if set. MYSQL_HOME should only be used if MARIADB_HOME is not set. See also the similar change